Pitman-bar



(Modem G- P. CONANT.

PITMANBAR.

No. 249,011. Patented Nov. 1,1881.

ATTORNEYS.

UNITED STATES PATENT OFFICE.

GEORGE P. CONANT, OF GENEVA LAKE, WISOONSIN.

PlTMAN-BAR.

SPECIFICATION forming part of Letters Patent No. 249,011, dated November1, 1881.

(Model.)

T 0 all whom it may concern:

Be it known that I, GEORGE P. CONANT, of Geneva Lake, WValworth connty,Wiseonsin, have invented a new and Improved Pitman- Bar, of which thefollowing is a specifioation.

Ordinaly pitman bars or rods are connected with the shaft by means of aerank at the end of the shaft, or to cranks formed by bending thesl1aft. By this arrangement the whole body of the pitman-bar is carriedwibh the crank, causing a considerable loss of power and an undesirablejarring or shaking efieci, due to the centrifugal force of thepitman-bar, and when rnnning ai: high rates of speed the centriiugalforce of the pitman becoxnes inju- IinS, causing the whole shnft t0vibrate.

The objeet of my invention is in overcome this difficulty, and also toprovide a pitmanconnection which may be attached to a straight shafLatany point in its length; and to these ends my invention consists,principally, of a pitman-hend formed witb cross-slots, in combinationwith a crank adapted tobe secnred u pon the shaib, the crank-pin ofwhich is adapted to move in one of said slots of the pitman-head, theother slot thereof being t0 accommodate the backward-and-forwardmovement of the pitman and pitman-head in a right lime upon the shaft,the crank-pin being provided with a sliding bloek, so that thepin willpass the slot for the shatt.

In the acconipam ing drawings, Figure 1 is a section taken on the line90 w, Fig. 2; and Fig. 2 is a plan view of my invention, partly insection.

Similar letters of reference indieate corresponding parts.

A represents the pitman-head, and B represents the, crank. ThepiLman-head is formed with the slots a a, which cul: each other ai;righi: angles. The slot a is of such size that the slota, so as to carrythecrank-pin smoothly past it as the crank revolves. By thisconstruction and arrangement of the parts, it will be observed th at theweight of the pitman is 11013 a load upon the crank, and that the rearand of the pitman D is not carried aronnd by the crank, but; moves in adirect lime through the guide F, and prodnces no vibration or shaking ofthe shaft, as is the case when connected in the ordinary way. The crankB is secured upon the shaft by means of the set-screwf, which passesthrongh the collarg of the crank, and by loosening the screw it may bemoved to any point desired in the shaft. The pitmanhead is held in placenpon the shaft by the movable collar E, so that; it: may also be movedWith the pitman to any desired point in the shaft.

Having thns described my invention, 1 elain1 as n'ew and desire tosecure by Letters Patent 1. The pitman-headA,formed with the slots a aat right angles to each other, in combination with the crank B and thesliding block b,

substantially as and for the purposes set forth.

2. The movable crank B, having the sliding blook b, in combination withthe movable pitman-head A, formed with the slots a a, and the pitman D,moving through the guide F, substantially as and for the purposes setforth.

GEORGE PUTMAN CONANT.

Wi tnesses:

ALBERT E. LYTLE, WM. R. NETHEROUT.

